The application of ultraviolet radiation in water treatment has a history of several decades. However, due to its complex technology and high cost, its application is limited. But nowadays, ultraviolet technology has been widely used abroad, which has abolished traditional chlorination disinfection and made it more effective. In the 1970s, due to the intensification of water pollution and the increasing public health awareness, people were forced to adopt new methods based on traditional water treatment processes to ensure that the water quality met safer drinking water standards. After nearly 20 years of research and practice, the composite application technology mainly composed of ultraviolet radiation has become a deep purification technology for water supply due to its excellent treatment effect

(1) The use of ultraviolet light for disinfection of urban sewage secondary treatment effluent can meet the requirements of domestic landscape and greening water use.

(2) This technology has the characteristic of no secondary pollution and has broad application prospects.

(3) Low energy consumption and operating costs; High degree of automation; Easy to maintain.

In addition, wastewater that has been disinfected with ultraviolet radiation can be reused in many fields to achieve wastewater resource utilization. Using it for irrigation of farmland, forests, lawns, etc. can avoid damage to plants by chemical disinfectants; Used for groundwater recharge can prevent formation blockage caused by microbial adaptation to chemical disinfectants and subsequent reproduction. With the in-depth research on the mechanism of ultraviolet disinfection, the continuous development of ultraviolet technology, and the continuous improvement of disinfection device design, ultraviolet disinfection is expected to become one of the main methods to replace traditional chlorination disinfection.